Have a go at this mini Key Stage 2 SATs test.
See if you'd pass.
I think it's incredibly important that all 10 year olds know what subordinating conjunctions, modal verbs and determiners are because I use these terms on a daily basis in my actual daily grown up life.
In fact, I'm delighted that my kids will be spending more time learning to label parts of speech and consequently less time on largely irrelevant stuff like computer programming, art, developing social skills, music, history, geography etc. The sort of things that barely impacts on my actual daily grown up life as I work alongside other people, use computers every day, travel, work as a social scientist, appreciate a wide range of cultural experiences such as music on the radio, plays, art galleries .......
While I totally get the need for kids to learn good spelling, punctuation and grammar, somehow I can't get my head round the feeling that things have just gone nuts. Firstly, learning to label grammar parts is not the same as learning to use good grammar. Secondly, learning to label grammar parts at the expense of learning all the other much more useful stuff seems crazy.